Current concept of stress fractures with an additional category of atypical fractures: a perspective review with representative images.

"Conflict of interest statement: The authors declared the following potential conflicts of interest with respect to the research, authorship, and/or publication of this article: The department to which the first author (YO) belongs received funding for operating costs from Saku Central Hospital of the Nagano Prefectural Federation of Agricultural Cooperatives for Health and Welfare, Suwa Central Hospital, Doujin Hospital, Medtronic Sofamor Danek Co, Ltd, Stryker Japan K.K., HOYA Technosurgical Co, Ltd, and NuVasive Japan K.K. The other authors declare that they have no conflicts of interest."

"Funding: The authors disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: This work was supported by JOA-Subsidized Science Project Research (grant no. 2021-2) and JSPS KAKENHI (grant no. JP19K18451). The sponsors had no involvement in the drafting of the manuscript or the decision to submit the manuscript for publication."